Elektromotus EMUS 4-Cell BMS

Recent development of rechargeable battery technology allowed wider use of electric propulsion in electric vehicles, electric motorcycles, boats etc. Most popular high performance batteries are based on Lithium chemistries. Such batteries require systems to keep them in the specified usage range while being used. The Battery Management System (BMS) is required for batteries that are sensitive to their usage conditions such as current, voltage and temperature. Emus BMS is the product intended for use with LiIon, LiPO, LiFePO4 and other chemistries prismatic battery cells which operating voltages range is from 2V to 5V. Emus BMS is a distributed type of digital BMS with central Control Unit. It does the balancing of the cells by dissipating the excess energy of cells as heat which is often referred to as passive balancing.

Included

BMS control unit

BMS cell modules

Dual range current sensor

Optional Accessories (sold separately)

Bluetooth Adapter

Solid State Relay

Display (tablet or phone with Android OS or Windows Mobile OS)

Spare BMS cell modules

Elektromotus (EMUS) BMS Features

Support of various charging algorithms by flexible software upgrades

Voltage and current control of battery charger via CAN bus

Supported CAN charger: currently Elcon PFC series, other models implemented by software upgrade

Observation of every battery cell voltage and temperature

Control of battery cell equal charge applying shunting current

Gradual control of shunting current from 0 to maximum

Possibility to limit shunting current to specified maximum which reduces dissipated heat

Small size of the cell modules and variable length „+“ terminal wire allows installation on the prismatic cells of different sizes

Tool-less installation

Cell modules can be installed without tools (only a bolt wrench is needed for cell terminals) as cell modules have spring-loaded terminals that allow reliable connection of wires by hand. Pre-cut inter-connection wires are supplied in the shipped package for quicker installation. When connected to Control Unit blinking green LEDs on Cell Modules indicate live communication and allow quick identification of problematic cell connection.

Linear zero to max, configurable maximum balancing current – useful to define maximum balancing current and amount of heat dissipated by modules during balancing.

Cell voltage measurement

Real-time bar graph on LCD or PC – useful to detect faulty cells and track battery health, or as general visualisation for advanced users.

Cell temperature measurement

Real-time value on LCD and bar graph on PC – useful for controlling charger and load in high temperatures, for setting charging mode and contol of battery heater in cold weather (lithium batteries can‘t be charged below freezing point). Many other BMS systems are not suitable for use in cold environment.

Early cell balancing

Balancing is done while charging, battery pack is in balance when charged – takes no additional time. Many other BMS systems start the balancing only when at least one cell is fully charged and overall charging time is drastically increased (in terms of hours).

Digital one-wire interface between cells

Allows neat and robust installation with lowest count of wires that could break

Forward Error Correction algorithm

Increases data ransfer robustness and drastically reduces possibility of faulty data – data is corrected by Control Unit, even if it arrives with errors caused by high EMI levels.

Periodically sending the working status and parameters which can be received by LCD display or other device. Parameters output format specification is available upon request.

CAN interface

Used for controlling CAN-capable charger and broadcasting working status and parameters to other devices that could be connected on CAN bus. Broadcasted parameters specification is available upon request. Other peripherals support is possible after firmware upgrade.

CAN-equipped charger control

Precise charging process control by setting required charging voltage and current and monitoring actual values. Currently chargers produced by www.hztiecheng.com are supported. Additional charger models can be added by software upgrade.

Simple charger control

Ordinary charger may be conveniently used as BMS detects charger's plug connection to AC mains outlet via optional isolated charger sensing solid state relay. Charger switched on and off via same solid state relay.

Bluetooth adapter (Optional)

Bluetooth adapter for EMUS BMS (allows Tablet PC and smartphones (runing on Windows Mobile or Android OS) to be used as Display unit for EMUS BMS, range - up to 10 meters)